Droplet surface exposure measurement of a large splashing oil fume in the kitchen with a fluorescent 3D microscopic passive testing method

Liu, Shiyu; Liu, Junjie; Wang, Pan; Ren, Jing; Wang, Jiahua

doi:10.1016/j.buildenv.2021.108223

Cited by 4 publications

(1 citation statement)

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“…We attribute the deposition source to the physically ejected oil droplets from frying that splash onto surfaces, as reported in previous studies. [5][6][7]62,63 Furthermore, the deposited oil film was completely saturated, as indicated by the absence of signals related to lipid unsaturation (D, E, F). While the deposition of saturated animal fats is possible, the presence of aldehydes (J) and SOZs (K) in the collected film demonstrates compelling evidence of unsaturated oil ozonolysis.…”

Section: Multiphase Ozonolysis Of Cookingmentioning

confidence: 99%

Chemical Fate of Oils on Indoor Surfaces: Ozonolysis and Peroxidation

Zhou,

Crilley,

Ditto

et al. 2023

Environ. Sci. Technol.

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Unsaturated triglycerides found in food and skin oils are reactive in ambient air. However, the chemical fate of such compounds has not been well characterized in genuine indoor environments. Here, we monitored the aging of oil coatings on glass surfaces over a range of environmental conditions, using mass spectrometry, nuclear magnetic resonance (NMR), and electron paramagnetic resonance (EPR) techniques. Upon room air exposure (up to 17 ppb ozone), the characteristic ozonolysis products, secondary ozonides, were observed on surfaces near the cooking area of a commercial kitchen, along with condensed-phase aldehydes. In an office setting, ozonolysis is also the dominant degradation pathway for oil films exposed to air. However, for indoor enclosed spaces such as drawers, the depleted air flow makes lipid autoxidation more favorable after an induction period of a few days. Forming hydroperoxides as the major primary products, this radical-mediated peroxidation behavior is accelerated by indoor direct sunlight, but the initiation step in dark settings is still unclear. These results are in accord with radical measurements, indicating that indoor photooxidation facilitates radical formation on surfaces. Overall, many intermediate and end products observed are reactive oxygen species (ROS) that may induce oxidative stress in human bodies. Given that these species can be widely found on both food and household surfaces, their toxicological properties are worth further attention.

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